Changing trends in preadjusted edgewise system /certified fixed orthodontic courses by Indian dental academy

INDIAN DENTAL ACADEMY
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“anchorage burning appliance” - - A torque of 7° on central incisors was soon
found to be insufficient, since the play
between archwire and bracket slot, which
wasn’t taken into account, creates important
loss of information during retraction stages
and hence the amount torque necessary to
compensate for the unwanted lingual tipping
was clearly greater than 7°

1974, Ronold Roth:


Wick Alexander :


“Fully Programmed Translation brackets”
by Andrew’s
- These are three sets of information mixed
according to the treatment needs.
-These come in 3 sets bearing values of
angulation, torque and anti rotation


“Minimum translation brackets”


“Medium Translation Brackets”


“Maximum Translation Brackets”


Summarizing so far…
-All the above prescriptions globally
reflect the treatment philosophy of their
different authors.
-It will be necessary for the practitioner to
complete the programme by adding
information to the wire.

Incisor torque

Andrews

Roth

Alex Root Benett Hilgers


Canine Position

Andrews Andrews

Roth

Alex

Root

Max

Bennett

Hilgers

Evolution toward facial type
This evolution is also taking place in
cephalometrics where the notion of mean now
tends to be replaced by growth considerations.
This
corresponds
to
the
need
for
individualization of information.
Since variability in the morphology of the facial
skeleton necessarily implies variability in the
dento-alveolar compensations.

“Dolichofacial”


“Brachyfacial”


SNA - 840
SNB – 770
ANB- 70
Mnd- FH- 250
0

U1 to SN -103 0
U1 to NA- 260, 3mm
L1 to MP- 1020
L1 to NB- 300, 6mm


0

SNA - 79 0
SNB – 820
ANB- 30
Mnd- FH- 230
U1 to SN -1080
U1 to NA- 250, 3mm
L1 to MP- 900
L1 to NB- 230, 3mm


SNA - 840
SNB – 780
ANB- 60
Mnd- FH- 360
U1 to SN -1140
U1 to NA- 320, 8mm
L1 to MP- 930
L1 to NB- 260, 4mm

Cl. III

Cl. I

Cl.II

Cl. III Cl. I Cl. II


Cl. III Cl. I Cl. II

At the incisor level:

Maxillary deficiency

Normal transverse
relationship


Mandibular deficiency

At the Canine Level

Hypo-maxilla

Normo -transversal


Hypo-mandible

At the Molar level:

Maxillary deficiency

Normal transverse
relationship


Mandibular
deficiency

Thus, In the absence of functional
anomalies:
1. The
dento-alveolar
compensations
(inclination and angulation) take place
in a coherent way, in accordance with
every single facial type, determined by
skeletal relationships, either established
in the three planes.

2. No matter what technique is used, the
information (torque and angulation) we apply
must also be coherent in the three planes.

In the sagittal plane, the inclinations (or
torque ) of the incisors must be coordinated
with the angulations of the buccal segments in
a well balanced dento-alveolar system


•The torque level is high on the
incisors, the angulation values in the
buccal segments, especially on the
canines will be greater.
•On the contrary, if the torque level on
the incisors is low, the angulations in
the buccal segments, especially on the
canines, will be smaller.

In this case, the high
torque level on the incisors
doesn’t

come

with

a

sufficient angulation of the
buccal

segments;

this

creates a high risk of root
approximation.

Here, the high level of
torque on the incisors
comes with a sufficient
canine angulation but an
insufficient angulation of
the bicuspids; this creates
an occlusal disturbance
and a risk of root
approximation.

Here, the canine has a positive torque, which is
adopted to the transverse skeletal relationships: if
the torque on the bicuspids is not coordinated, an
occlusal disharmony is created.

“A normal face is no longer one where
cephalometric values are closest to the
mean, but one whose cephalometric
values

show

relationships

harmony
defined

in
in

their
variable

association tables. In this concept, there
is no such thing as a unique normal face
defined by a mean value, there are a series
of normal faces” - J. Dibbets.

Leader in continuing dental education


Changing trends in preadjusted edgewise system /certified fixed orthodontic courses by Indian dental academy

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